Four prong plug



FIG. 1 is a top perspective view of a four prong plug;

FIG. 2 is a bottom perspective view of the four prong plug of FIG. 1;

FIG. 3 is a left view of the four prong plug of FIG. 1:

FIG. 4 is a right view of the four prong plug of FIG. 1:

FIG. 5 is a front view of the four prong plug of FIG. 1;

FIG. 6 is a back view of the four prong plug of FIG. 1;

FIG. 7 is a top plan view of the four prong plug of FIG. 1; and,

FIG. 8 is a bottom plan view of the four prong plug of FIG. 1.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a four prong plug, as shown and described. 